固体火箭发动机绝热层脱粘的红外热像检测规律

Regularities of Infrared Thermography of Disbonds in Insulator of Solid Rocket Motors

闪光灯激励的红外热像检测法是一种非接触式的光学无损检测技术,有望应用于固体火箭发动机绝热层脱粘的在线检测。为了推进该技术在固体火箭发动机绝热层脱粘检测中的应用,用数值模拟和实验方法研究了固体火箭发动机绝热层脱粘脉冲热像检测的规律,得到了决策参数与结构参数之间的定量关系;提出了检测极限的确定准则,并计算了脱粘大小和深度(绝热层厚度)的检测极限;提出了脱粘尺寸的测量方法及误差修正公式。所得的方程、数据和结论为固体火箭发动机绝热层脱粘的红外无损检测提供了科学依据和操作准则。

Flash infrared thermography（IRT）is a non-contact optical non-destructive technique,which has a promising application in the on-line inspection of disbonds in insulator of solid rocket motors（SRMs）.In order to promote the application of IRT in the disbond inspection of insulators in SRMs,the basic regularities of pulsed thermography（PT）of disbonds in the insulator of SRM cases are studied by using numerical simulation and experiment.The relationships between decision-making parameters and structure parameters are obtained,the criterion to determine detection limits is proposed,the detection limits of disbond size and depth（i.e.insulator thickness）are calculated,and the method to characterize the disbond size and the error correction formula are provided.The equations,data and conclusions provide a scientific basis and operational guidelines for the infrared thermography of disbonds in insulator of SRMs.